Base for pressurized bottles

Abstract

A plastic bottle with a base centered on a vertical axis, a continuous standing ring to support the bottle, a side wall formed unitarily with the base extending from the base upward to an upper side wall end, and a neck connected to the side wall upper end, the neck including a finish adapted to receive a cap to close an opening into the bottle interior. The bottle base standing ring is defined in vertical cross-section by a continuous curve bounded on a radial inside by an interior region that can include a plurality of concave domed wedge-shaped sections interspaced with buttress sections having substantially planar inclined outer portions. The bottle base standing ring has a diameter less than 80% of the maximum side wall width and is bounded on a radial outside by a conic section portion centered on the vertical axis having an apex angle of less than 1600 to improve the perpendicularity of the bottle.

1 . A plastic bottle comprising a base centered on a vertical axis, the base having a standing ring to support the bottle on any underlying support surface, a side wall formed unitarily with the base and extending from the base upward to an upper end of the side wall, and a neck connected to the upper end of the side wall, the neck including a finish adapted to receive a cap to close an opening into the bottle interior, the bottle having a height defined by the distance between the opening and the standing ring, and a maximum width across the side wall, the base standing ring being defined in vertical cross-section by a continuous curve, the continuous curve being bounded on a radial inside by an interior region, the continuous curve being bounded on a radial outside by a conic section portion centered on the vertical axis, the base standing ring having a diameter less than 80% of the maximum side wall width. 
     
     
         2 . The plastic bottle of  claim 1 , wherein the conic section portion has an apex angle of less than 160°. 
     
     
         3 . The plastic bottle of  claim 1 , wherein the base standing ring diameter is more than 70% of the maximum side wall width. 
     
     
         4 . The plastic bottle of  claim 1 , wherein the standing ring has an average thickness that is between 1.0 and 1.3 times the average thickness of the side wall. 
     
     
         5 . The plastic bottle of  claim 4 , wherein the variation in standing ring thickness is less than ±20%. 
     
     
         6 . The plastic bottle of  claim 1 , wherein the continuous curve of the standing ring has a defining radius in vertical cross-section of between 0.100 inches and 0.300 inches. 
     
     
         7 . The plastic bottle of  claim 1 , wherein the interior region comprises a plurality of concave domed wedge-shaped sections interspaced with buttress sections having substantially planar inclined outer portions. 
     
     
         8 . The plastic bottle of  claim 7 , wherein the concave dome portion is defined by a curve having a radius of at least 1.0 times the standing ring diameter. 
     
     
         9 . The plastic bottle of  claim 7 , wherein the planar inclined outer portions of the buttress sections are inclined at an angle of between 8° and 16° with respect to a plane defined by the base standing ring. 
     
     
         10 . The plastic bottle of  claim 7 , wherein the angle of tangency at the point of intersection of the concave dome portion and the curve defining the standing ring measured from the plane defined by the standing ring is between 45° and 55°. 
     
     
         11 . A plastic bottle comprising a base centered on a vertical axis, the base having a continuous circular standing ring to support the bottle on any underlying support surface, a cylindrical side wall formed unitarily with the base and extending from the base upward to an upper end of the side wall, and a neck connected to the upper end of the side wall, the neck including a finish adapted to receive a cap to close an opening into the bottle interior, the bottle having a height defined by the distance between the opening and the standing ring, and a maximum diameter across the side wall, the base standing ring being defined in vertical cross-section by a continuous curve of constant radius having a diameter of between 70% and 80% of the maximum side wall diameter, the continuous curve of the standing ring being bounded on a radial inside by an interior region, the continuous curve of the standing ring being bounded on a radial outside by a constant angle tapered portion defined by a conic section centered on the vertical axis having an apex angle of less than 160°. 
     
     
         12 . The plastic bottle of  claim 11 , wherein the standing ring has an average thickness that is between 1.0 and 1.3 times the average thickness of the side wall and the variation in standing ring thickness is less than ±20%. 
     
     
         13 . The plastic bottle of  claim 11 , wherein the continuous curve of the standing ring has a defining radius in vertical cross-section of between 0.100 inches and 0.300 inches. 
     
     
         14 . The plastic bottle of  claim 11 , wherein the interior region comprises a concave domed shaped portion. 
     
     
         15 . The plastic bottle of  claim 14 , wherein the concave domed shaped portion includes a plurality of concave domed wedge-shaped sections interspaced with buttress sections having substantially planar inclined outer portions. 
     
     
         16 . The plastic bottle of  claim 15 , wherein the buttress sections planar inclined outer portions are inclined at an angle of between 8° and 16° with respect to a plane defined by the base standing ring. 
     
     
         17 . The plastic bottle of  claim 14 , wherein the concave dome portion is defined by a curve having a radius of at least 1.0 times the standing ring diameter. 
     
     
         18 . The plastic bottle of  claim 14 , wherein the angle of tangency at the point of intersection of the concave dome portion and the curve defining the standing ring measured from the plane defined by the standing ring is between 45°and 55°. 
     
     
         19 . The plastic bottle of  claim 11 , wherein the constant angle tapered portion outside the base standing ring has a width of between 0.035 inches and 0.095 inches. 
     
     
         20 . A plastic bottle comprising a base centered on a vertical axis, the base having a continuous circular standing ring to support the bottle on any underlying support surface, a cylindrical side wall formed unitarily with the base and extending from the base upward to an upper end of the side wall, and a neck connected to the upper end of the side wall, the neck including a finish adapted to receive a cap to close an opening into the bottle interior, the bottle having a height defined by the distance between the opening and the standing ring, and a maximum diameter across the side wall, the base standing ring having a diameter of between 70% and 80% of the maximum side wall diameter, the base standing ring being defined in vertical cross-section by a continuous curve of constant radius of between 0.100 inches and 0.300 inches, the continuous curve of the standing ring being bounded on a radial inside by an interior region that includes a plurality of concave domed wedge-shaped sections defined by a curve having a radius of at least 1.0 times the standing ring diameter, the concave domed wedge-shaped sections intersecting the continuous curve of the standing ring at an angle of tangency measured from a plane defined by the base standing ring of between 45° and 55°, the plurality of concave domed wedge-shaped sections being interspaced with wedge-shaped buttress sections having substantially planar outer portions inclined at an angle of between 8° and 16° with respect to the plane defined by the base standing ring, the continuous curve of the standing ring being bounded on a radial outside by a constant angle tapered portion defined by a conic section centered on the vertical axis having an apex angle of less than 160° and having a width of between 0.035 inches and 0.095 inches.